^well, i'll hold out on my opinion for the new Moon Crying till i hear the whole thing. xD
but about the last 2 Ai no Utas...
the first one (i forgot which show..the one where she perfromed Lick me, CWGB, and You're So Beautiful) was too over done i think.
and the new one (where she performed TAXI with that other singer) has back-up vocals, the piano sounds smoothe and clear, and it's not THAT over done. so that one is good.
personally, i LOVE piano versions.